How do I test asynchronous code using Jest?
To test asynchronous code in Jest, you can use either callbacks, promises, or async/await syntax.
Can you show me an example using async/await?
Sure! Here's a simple example:
test('fetches data', async () => {
const data = await fetchData();
expect(data).toEqual(expectedData);
});
What if the promise is rejected?
You can use rejects
to test for rejected promises:
await expect(fetchData()).rejects.toThrow('Error');
Are there any best practices for testing async code?
Yes, always ensure your tests are isolated, use proper timeouts, and clean up after tests to avoid side effects.
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